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Remove concept of Layers from Servo

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Layers were a feature of the legacy drawing path. If we re-add them at
some point, it probably makes more sense to make them a product of
display list inspection.

This change also remove a bunch of dead painting code.
This commit is contained in:
Martin Robinson 2016-10-19 15:14:02 +02:00
parent e667e62f0c
commit ccb7ab926a
21 changed files with 57 additions and 745 deletions
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51
components/gfx_traits/lib.rs
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@ -23,7 +23,6 @@ pub mod color;
pub mod print_tree;
use range::RangeIndex;
use std::fmt::{self, Debug, Formatter};
use std::sync::atomic::{ATOMIC_USIZE_INIT, AtomicUsize, Ordering};
/// The next ID that will be used for a special stacking context.
@ -80,56 +79,6 @@ pub enum ScrollPolicy {
FixedPosition,
}
#[derive(Clone, PartialEq, Eq, Copy, Hash, Deserialize, Serialize, HeapSizeOf)]
pub struct LayerId(
/// The type of the layer. This serves to differentiate layers that share fragments.
LayerType,
/// The identifier for this layer's fragment, derived from the fragment memory address.
usize,
/// An index for identifying companion layers, synthesized to ensure that
/// content on top of this layer's fragment has the proper rendering order.
usize
);
impl Debug for LayerId {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
let LayerId(layer_type, id, companion) = *self;
let type_string = match layer_type {
LayerType::FragmentBody => "-FragmentBody",
LayerType::OverflowScroll => "-OverflowScroll",
LayerType::BeforePseudoContent => "-BeforePseudoContent",
LayerType::AfterPseudoContent => "-AfterPseudoContent",
};
write!(f, "{}{}-{}", id, type_string, companion)
}
}
impl LayerId {
/// FIXME(#2011, pcwalton): This is unfortunate. Maybe remove this in the future.
pub fn null() -> LayerId {
LayerId(LayerType::FragmentBody, 0, 0)
}
pub fn new_of_type(layer_type: LayerType, fragment_id: usize) -> LayerId {
LayerId(layer_type, fragment_id, 0)
}
pub fn companion_layer_id(&self) -> LayerId {
let LayerId(layer_type, id, companion) = *self;
LayerId(layer_type, id, companion + 1)
}
pub fn original(&self) -> LayerId {
let LayerId(layer_type, id, _) = *self;
LayerId(layer_type, id, 0)
}
pub fn kind(&self) -> LayerType {
self.0
}
}
/// A newtype struct for denoting the age of messages; prevents race conditions.
#[derive(PartialEq, Eq, Debug, Copy, Clone, PartialOrd, Ord, Deserialize, Serialize)]
pub struct Epoch(pub u32);